Chaser holder



April 29, 19z4 1,492,425

C. G. CASHMAN CHASER HOLDER Filed Feb. 21, 1920 atented Apr. 29, 1924. i

UNITED u STATES PATENT OFFICE.

CLARENCE G.CASHMAN, OF WAYNESBORO, PENNSYLVANIA, ASSIGNOR, BY DIRECT ANDMESNE ASSIGNMENTS, T0 LANDIS MACHINE COMPANY, 0F WAYNESBOEO,PENNSYLVANIA, A CORPORATION 0F PENNSYLVANIA. y

CHASER HOLDER.

Application led February 21, 1920. Serial No. 860,464.

To all whom z't may concern:

Be it known that I, CLARENCE G. CASH- MAN, a citizen of the UnitedStates, resid-y ing at Wa nesboro, in the county of Franklin and tate ofPennsylvania, have invented certain new and useful Improvements inChaser Holders, of which the following is a specification.

My invention relates to improvements in Chaser holders and particularlyto details of construction thereof,

The Chaser holders now in use are provided with beveled or dovetailedlocating channels on the chasers to seat upon angular or dovetailchannels on the holders, and the chasers also are provided with clampingshoulders or dovetails adapted to be engaged by one edge of a Clamp orlock bar, the other edge of which engages in a clamp angle or lock barchannel formed in the Chaser holder. 'Ihis construction is such thatgreat pressure is necessary on the clamp or lock bar to hold the Chaserfrom lateral movement, due to the small amount of frictional Contactfurnished by the locking elements. f

It is one of the objects of my invention to simplify the locking ofgtheChaser so that a minimum of pressure is necessary on the locking bar tomaintain the Chaser in an immovable position.

In carrying out this part of my invention, I increase the frictionalcontacting surfaces of the Chaser and lock bar by forming a series oflongitudinally extending serrations thereon whichrit into correspondingserrations cut in a parallel plane on the Chaser holder or block.

A further object of my invention is to improve the construction of theChaser adjusting means. The disadvantage of the resent type is thatafter the Chaser has Eecome worn and is ground ed and is comparativelyshort the screw has moved alongv into the screw way so far that the headis not exposed and it is necessary to use a screw driver to makeadjustments, and also renders it necessary in changing from a shortChaser to a long one, to retract the screw through all of the distanceit has traversed, which obviously takes a great deal of time andtrouble.

In carrying out this part of my invention I provide a screw carryingstop or block mounted upon a spindle adapted to enter one of a series ofopenings or holes in the path of travel of the Chaser. The end of thescrew bearing on the rear end of the Chaser, and large adjustments beingmade by advancing the stop or blockI from one hole to another.

In the accompanying drawings forming art of this specification,

igure 1, is a vertical section through a Chaser holder showing theserrated faces and, in dotted lines, the position of the holes for thespindle of the screw Carrying stop,

Figure 2, is a vertical section partially broken away showing theapplication of my invention to a Conventional form of Chaser holder,

Figure 3, is a perspective view of a Chaser formed With serrations inaccordance with my invention,

Figures 4 and 5, are perspective views of forms of lead angle fillblocks or plates with serraticns formed in the locking faces thereof,

Figure 6, is an enlarged fra mentary perspective view of a Chaser ho derand Chaser, showing the relation of the screw Carrying sto and spindleto the Chaser and to the spind e receiving holes in the Chaser holder,and

Figure 7, is a perspective view of a lock bar formed in accordance `withmy invention.

The Chaser holder 1 (Fig. 2) has a Chaser seating face 2 formed withlongitudinal serrations 3, and a lock bar channel 4, 'with similarserrations 5, extending longitudinall thereon.

'l ese -serrations 3 and 5, can also be applied te lead angle ll plates6 and 'l' of Chasers holder l (Fig. 1), as shown in Fig-4 ure l, whichform the subject matter of a separate application filed of even dateherewith.

rIhe Chaser 8 is made with a seating face 9, having longitudinallyextending serrations 10, formed to interlock with the serrations 3 onthe Chaser seating face, the Cutwardly projecting serrations of one faceextending into the inwardly formed serrations of the other.

The chasers are provided with lock har contact faces having seri-ations11 formed thereon. n This lock bar contact face takes the place fof thedovetail `angle or shoulder now in lse. Lockhbflr 12 has seratedlenl; ain e es13,w ic en a can interoc vih tghe srrations 11 am? 5g The lockbar is clamped in position by the usual screws 14 which engage openings14 in the lock barv 12. 3

`It will be obvious that the use of serrations in lace of smooth facesinsures much greater rictional contact and that the chasers will be heldimmovable by comparatively slightpressure on the lock: 1 bar.

At convenient intervals 1n the chaser holder and perpendicular to themain body of the chaser are formed the holes or openings 15, to receivethe spindle 16 of the screw carrying sto or block 17, in which the screw18 vis rotata ly mounted. One end of the screw bears V against the rearend of the chaser for longitudinal adjustment thereof.

In making adjustments on the chaser, as when inserting a long one inplace of a short one, the stop or block is lifted up` and removed fromthe hole in which it is support.- ed and moved to any other hole that 1tmay be convenient to use. Obviously this precludes the necessity forretractlng or advancing the screw to any great extent.

I claim:

1. In a cutter head, a chaser holder havy ing openings, a chaser andmeans for holding said chaser in position on said chaser holder, andmeans supported in one of said holes or openings' and capable of removaland insertion in other of said openings for longitudinal adjustment ofsaid chaser.

2. In a cutteryhead, a chaser holder having openings, a chaser and meansfor holding t and means coo erating with the openings in said holder orlongitudinal' adjustment` of said chaser.

3. In a cutter head, a cha'ser holder hav.- ing o enings, a chaserandmeans for holding. the chaser in position on said holder, vand a screwcarrying block and a spindle /Iiolder and formed with two e chaser inposition on said holder,v

adapted to cooperate with said o enings for longitudinal a justinent ofsaid c aser.l

4. In a cutter head, a chaser holder llavmg openings, a chaser havingchtting serrations on one face and clamping means for holding the chaserin position on said holder, the contacting surfaces of the/jchaser,chaser holder and clampin means being formcdwith serrations para lel tothe first mentioned serrations so that a maximum frictional engagementis had and the chaser is held a ainst lateral movement, and `meanscooperating with the openings in said holder for longitudinal adjustmentof said chaser. y

5. A chaser holderhavin a chaser channel and a lock .bar channe, lead anle fill plates in said channels, a chaserA 1n the chaser channel havinga lon itudinal shoulder on the back thereof, a yook bar inthe lock barchannel engaging said shoulder and one fill plate, the contactingsurfaces of the fill plates, chaser, lock bar and shoulder having`longitudinally extendin lserrations, and means to secure the lock arthereby clampin the chaser,

6. A ead an le fill plate for adjustin chasers in their'olders,comprising a bloc havin two opposite lfaces at a small angle to eacother,'one of said faces being formed with lon itudinally extendingserrations.

7. A c aser holder comprising, a chaser formed with serrations on oneface thereof,-

a lead angle `fill plate having two'or posite faces` inclined to eachother one of w ch is serrated to rovide a seat for the serrated face ofthe c aser, substantially as set forth.

8. A chaser holder comprislng, a chaser,

lead angle fill lplate secured in said chaser olppo'site faces arengaging inclined to each other' a lock the chaser and fill plate, thecontactin portion of the lock ar and lill plate ing formed withmterengaging serrations, substantially as set forth.

' In testimony whereof I aix my signature.

vCLAREirIoE G. CASHMAN.

